KR20040065286A - A Heat Exchanger Plate, a Plate Pack, and a Plate Heat Exchanger - Google Patents

Abstract

The invention refers to a heat exchanger plate ( 4 ) for a plate heat exchanger ( 1 ), a plate package ( 3 ) and a plate exchanger ( 1 ). The plate ( 4 ) includes at least a first area ( 31 ) with a corrugation of ridges and valleys, the plurality of which extends in a first direction (A), and at least a second area ( 32 ) with a corrugation of ridges and valleys, the plurality of which extends in a second direction (B). The plate ( 4 ) has a central rotary axis extending in parallel with a normal line of the plate. The areas ( 31, 32 ) have a respective contour coinciding with a respective imaginary contour in a first rotary position of the plate with regard to the rotary axis and after a rotation 90° to a second rotary position of the plate with regard to the rotary axis.

Description

A Heat Exchanger Plate, a Plate Pack, and a Plate Heat Exchanger

The present invention relates to a heat exchanger substrate for a plate heat exchanger. The plate comprises at least a first area having corrugations in the floor and valleys. The plurality of wrinkles extend in the first direction. The plate has a central axis of rotation extending parallel to the normal line. The invention also relates to a plate package and a plate heat exchanger for a plate heat exchanger.

A 90 ° rotary heat exchanger substrate is known from EP-A-165 179. This plate has a substantially square shape to form a plate package. The entrance and exit extend through the sides of the package. That is, the heat exchange medium enters and exits the plate package in a direction substantially parallel to the main extension plane of the plate. Each plate has four side edges. Here, the two opposite sides are folded down and the remaining two opposite sides are folded up. Every second plate is rotated 90 ° in the plate package, with the side folded down of the plate touching the side edges folded over the adjacent plate, which are connected to each other by welding. Tabs are formed at each corner of each plate, which extends diagonally in a plane substantially perpendicular to the plane of extension of the plate.

The plate disclosed in EP-A-165 179 has an active heat exchange surface with corrugations of floor and valleys, which extend diagonally at an angle of 45 ° to the side edges of the plate. For manufacturing techniques, wrinkles cannot extend to the side edges but there must be an edge area for example to bend the edges. This edge region may in principle be a linear curved region alone, but preferably has a plane having a width of 10 mm to 15 mm. Due to these folds, the upper plate is very strong for the diagonal shape in which the ridges and valleys extend, but very weak in the transverse direction of the folds.

The plate is made by compression molding. When this plate is compressed for patterning, the material extends in the transverse direction of the pleats. Then when the compressor is opened and the plate is detached, some backspring is created by the elasticity of the material. The main back spring occurs in the direction in which the plate has the lowest shape rigidity, so the deformation is relatively large. Thus, the first square plate obtains a rhombus shape after compression molding. This rhombus shape results in a pattern that does not fit well with adjacent plates in the finished plate package, which results in reduced pressure strength in the plate package.

The invention is described in more detail with reference to the description of the various embodiments disclosed herein by way of example and the accompanying drawings.

1 shows a side view of a plate heat exchanger.

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1.

FIG. 3 shows a sectional view along line III-III of FIG. 2.

4 shows a plan view of a plate package of a plate heat exchanger.

5 is a cross-sectional view taken along the line V-V of FIG.

FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 4.

FIG. 7 shows a cross section along line VII-VII in FIG. 4; FIG.

8 shows a plan view of a plate according to a second embodiment.

9 shows a plan view of a plate according to a third embodiment.

10 is a plan view of a plate according to the fourth embodiment.

The object of the present invention is to solve the above-mentioned problems. In particular, the focus is on plates, plate packages having such plates, and plate heat exchangers having such plates, which are designed to retain the outer shape after compression molding. Maintaining the outer shape after compression molding is an important condition during joining the plates by modern welding methods such as laser beam welding.

This object is achieved by an initially formed plate, which comprises at least a second region with ridges and corrugations. These plurality of corrugations extend in a second direction, each of which has a contour. This contour coincides with the imaginary stationary contour at the first rotational position of the plate with respect to the axis of rotation and at the second rotational position of the plate rotated 90 °.

Since the heat exchange surface comprises two regions with corrugations extending in each corresponding direction, the deformation of the shape of one region can be hindered by the deformation of the other region and vice versa. As a result, the total deformation of the shape of the plate can be prevented or reduced and also the original outer shape can be substantially maintained after compression of the plate. The definition of the contour includes the outer and inner contours of the area. One of the regions can be completely surrounded by, for example, another region, and the boundary between the inner region and the latter outer region forms an inner contour of the outer region.

According to an embodiment of the present invention, the area of the first area is substantially the same as the area of the second area. Furthermore, it is preferable that the first direction is perpendicular to the second direction. By designing such a plate, deformation of the shape can be substantially completely prevented.

According to another embodiment of the invention, the plate comprises a diagonal. The first direction is substantially parallel to this diagonal.

According to another embodiment of the invention, the plate coincides with the virtual stationary contour at the first and second rotational positions. This contour can be, for example, circular or polygonal with at least four sides, the plate having at least four corners and the diagonals extending between two of the corners opposite each other.

According to another embodiment of the present invention, the plate has an edge extending around the plate and an edge region extending around the plate within the edge. The total area of the edge region is smaller than that of the first and second regions and forms an active heat exchange surface. Furthermore, the plate is substantially square and has four side edges. The two first side edges are parallel to each other and fold in a first direction along each folding line extending parallel to the side edges in the edge region, and the two second side edges are parallel to each other The edge region is folded in a second direction along each folding line extending parallel to the side edges, the first direction being opposite to the second direction.

According to another embodiment of the invention, the plate comprises a support area. The support area extends around the first and second areas inside the edge area and includes ridges and valleys. In this corrugated support area, the floor and troughs can be oriented to suit the particular position in the plate package finished product so that the load acting on each support point can be uniform. By this particular corrugation for the support area, the number of support points in this area near the side edges of the plate can be substantially increased. Thus, in the support area, at least a large number of floors and valleys can extend in a direction away from the diagonal direction of the floors and valleys of the heat exchange surface. The floors and valleys of the support area will be shorter in their extension direction than the floors and valleys of the heat exchange surface. It is preferred that the plate comprises a marked boundary between the heat exchange surface and the support area.

According to one embodiment of the invention, the support area has such a ridge or valley at each corner, which extends in a direction substantially coincident with the diagonal between the corners. Furthermore, each floor and valley lying along the central portion of the side edges may extend in a direction substantially perpendicular to the side edges most closely adjacent to the floor and valleys. By design of this support area, the number of support points in this area can be increased by 50%. The floors and valleys in the support area may also have substantially the same spacing as the floors and valleys of the heat exchange surface. It is preferable that the ridges and valleys of the support area vary continuously from the substantially diagonal direction of the edges to the substantially vertical direction of the center portion.

According to another embodiment of the invention, the plate comprises an extension plane, which extends parallel thereto in the edge region. The valleys of the first and second regions are in this extension plane and the ridges of the first and second regions are located above this extension plane. Preferably, the valley of the support area is located below the extension plane and the floor of the support area can be located above the extension plane.

The object of the present invention can be achieved by a plate package for a plate heat exchanger comprising a plurality of plates arranged on each plate as defined above. The plate of the plate package can be arranged such that every second plate rotates 90 ° about the axis of rotation and an interspace is formed between adjacent plates, wherein the first and second regions are contours of the first region. It is advantageous to have the same shape as all the plates in this plate package and that the outline of the second area has the same shape as all the plates in the plate package. Furthermore, the plates in the plate package can be welded to each other, wherein the plates are arranged relative to each other in such a way that the first side edges of one plate are in contact with the second side edges of adjacent plates, and the side edges are welded together. Are connected to each other. Furthermore, the interspace may include a plurality of first interspaces and a plurality of second interspaces. The first interface is arranged to carry the first medium through the plate package and the second interspace is arranged to carry the second medium through the plate package.

The object of the invention is also achieved by a plate heat exchanger comprising a plate as defined above.

The object of the invention is also achieved by a plate heat exchanger comprising a plate package as defined above.

1 to 3 show the plate heat exchanger 1. The plate heat exchanger 1 includes an outer casing 2 and a plate package 3. The plate package 3 comprises a plurality of heat exchange plates 4, which are stacked and attached to each other.

The plate 4 has a center axis of rotation x. The central axis of rotation x extends parallel to the vertical line of the main extension plane p of each plate 4. All plates 4 are substantially identical and have a substantially square shape with four corners in the disclosed embodiment. It will be appreciated that the plate 4 may also have other polygonal or circular shapes. The plate 4 is rotatable about the axis x in such a manner that the outer contour coincides with the virtual fixed contour at the first rotational position and the second rotational position rotated by 90 °.

Each plate 4 has a heat exchange surface 5 with corrugations of floors and valleys as shown in FIG. Each plate 4 also has an edge region 6 which is substantially linear or planar in shape with an edge extending around the plate 4. The edge region 6 extends around the heat exchange surface 5 inside the edge. In the disclosed embodiment, the edges form four side edges 7 ', 7 ". The two side edges 7' are parallel to each other and folded down in the first direction along the corresponding fold line. The fold line extends parallel to the side edge 7 'in the edge region 6. The two second side edges 7 "are also parallel to each other and upward in the second opposite direction along the corresponding fold line. Folded This fold line extends parallel to the problem side edge 7 "in the edge region 6. At each corner of each plate 4, the tab 8 is formed when the side edge is folded, the tab 8 ) Extends in a diagonal direction in a plane substantially perpendicular to the extending plane p of the plate 4. This tab 8 mounts the plate 4 and the plate package 3 to the casing 2. More specifically, the tab 8 is attached directly or indirectly to the longitudinal grooves of the four corner posts, which corner posts are arranged at corresponding corners in the inner space of the casing 2. The pillar also functions to define the four subspaces between the casing 2 and the plate package 3.

Every second plate 4 in the plate package 3 is rotated 90 ° about the axis of rotation x, where the plate 4 is formed between the plates 4 between which the interspaces 13 ', 13 "are adjacent. And the first side edge 7 ′ of the plate 4 is arranged in the plate package 3 in such a manner as to contact the second side edge 7 ″ of the adjacent plate 4. Adjacent side edges 7 'and side edges 7 "are attached to each other by a weld joint 14 (see Figure 7). This weld joint 14 can be achieved by laser beam welding or electron beam welding. The interspaces 13 'and 13 "include a plurality of first interspaces 13' and a plurality of second interspaces 13" (see FIGS. 4-7). In this way, the plate The package 3 is open to the first interspace 13 'and closed to the second interspace 13 "when viewed from two opposing sides. In the other two opposing sides, the plate package 3 is closed with respect to the first interspace 13 'and open with respect to the second interspace 13 ". ) Is arranged to carry the first medium through the plate package 3 and the second interspace 13 "is arranged to carry the second medium through the plate package 3.

The plate heat exchanger 1 comprises a first inlet 16 and a first outlet 17 for the first medium and a second inlet 18 and a second outlet 19 for the second medium. The inlet and outlet of the plate package 3 extends properly through the side of the plate package 3. That is, the heat exchange medium flows in and out of the plate package 3 in a direction substantially parallel to the main extension plane p of the plate 4. In the disclosed embodiment, the plate package 3 comprises three partial packages a, b and c. These partial packages a, b and c are bounded to each other by two boundary plates 21 and 22. It will be appreciated that the plate package 3 may include other numbers of subpackages, for example, one, two, four, or more such subpackages.

In the disclosed embodiment, the first medium is conveyed in a partial package that is one side that leads through the first inlet 16 to the first interspace 13 ′. The first medium is conveyed to the subspace 10 leaving the partial package through the opposite side. In the subspace 10, the first medium passes through the boundary plate 21 and is conveyed to the subpackage b through one side of the first interspace 13 ′. This medium leaves the subpackage b through the opposite side and enters the opposing subspace 10. In this subspace 10, the first medium passes through the second boundary plate 22 and is conveyed to the subpackage c through one side of the first interspace 13 ′. The first medium then moves to the plate heat exchanger 1 via the opposite side of the subpackage c, the subspace 10 and the second outlet 17. In a corresponding manner the second medium is conveyed through the plate heat exchanger 1 and into the first inlet 18 via the second inlet. It should be appreciated that the second medium can also be conveyed back to the first medium in such a way that the outlet 19 forms the inlet and the inlet 18 forms the outlet.

In the embodiment disclosed in FIG. 4, the heat exchange surface 5 comprises a first region 31 having corrugations and ribs, and a second region 31 having corrugations and ribs. The valleys of the two regions 31 and 32 of the heat exchange surface 5 are located at or at the extension plane p and the corrugations of the two regions 31 and 32 of the heat exchange surface 5 are above the extension plane p. Located.

The floor and the valley of the first region 31 extend in the first direction A, and the floor and the valley of the second region extend in the second direction B. The first direction A is substantially perpendicular to the second direction B. FIG. Furthermore, the first direction A extends substantially parallel to the diagonal extending between two opposite edges of the plate 4, and the second direction B extends between the remaining two opposite edges of the plate 4. Are substantially parallel to the diagonal. It can be seen that the ridges and valleys of the regions 31 and 32 of the heat exchange surface 5 may extend along a direction other than the disclosed direction. The floors and valleys of the first region 31 need not extend perpendicular to the floors and valleys of the second region, but the floors and valleys of the first region 31 have a constant angle with the floors and valleys of the second region 32. It is important to achieve. The ridges and valleys of the areas 31 and 32 of the heat exchange surface 5 may extend along a curved path, for example to form a support point relative to an adjacent surface or to affect the flow into and out of the plate heat exchanger 1. It can have large or small obstructions or inhomogeneities to give. There may be an inserted portion having a pattern that deviates for other reasons.

The area of the first region 31 is substantially the same as the area of the second region. Each of the regions 31, 32 also has an outer and / or inner contour, which corresponds to a virtual fixed contour at the second rotational position rotated 90 ° with the first rotational position of the plate 4 about the axis of rotation x. Matches The second inner region 32 is 45 degrees with respect to the first outer region 31, which is square in shape and also square in shape. The outer contour of the inner region 32 forms or coincides with the inner contour of the outer region 31. In the plate package 4, the floor of the heat exchange surface 5 is always substantially in contact with the valleys of the heat exchange surface 5 of the adjacent plate 4, in which the floor is formed in such a way that a support point or small support area is formed. Cross the goal.

Each plate 4 comprises a support region 41, which extends around the heat exchange surface 5 in the edge region 6. This support area 41 also includes corrugations of ridges 42 and valleys 43. The boundary between the support region 41 and the heat exchange surface 5 is indicated by an extension plane p or a boundary line 44 located at its height. The valleys 43 of the support region 41 are located below the extension plane and the ridges 42 of the support region 41 are located above the extension plane p.

Near each corner, the support region 41 has these ridges 42 and valleys 43 extending in a direction substantially coincident with the diagonal between the edges. Along the central portion of the side edges, each floor 42 and valleys 43 of the support area 41 are located at the side edges closest to the floor 42 and valleys 43 inside one of the side edges. Extend in a substantially vertical direction. The direction of the ridge 42 and the valley 43 of the support region 41 continuously varies from the diagonal direction of the corner to the vertical direction of the center portion.

Accordingly, the floor 42 and the valley 43 of the support region 41 are formed in the valleys of the support region of the plate 4 on which the valleys 43 of the support region 41 of the plate 4 lie. 42) (see Figs. 6 and 7). In this way, a support or long support area is always formed between all adjacent plates 4 of the plate package 3, which extend in the direction of the floor 42 and the valleys 43. In addition, the support region 41 has a shape in which the outer and inner contours of the support region 41 coincide with respect to all the plates 4 of the plate package 3.

8 shows a plate 4 having a heat exchange surface 5 divided into two regions 31 and 32 according to the second embodiment. The inner region 32 has a square shape arranged in such a way that the side edges of the outer contour thereof extend in parallel to the side edges which are located closest to the outer contour of the outer region 31.

9 shows a plate 4 having a heat exchange surface 5 divided into two regions 31 and 32 according to the third embodiment. The inner region 32 has a circular shape where the center point is aligned with the center point of the outer region 31.

10 shows a plate 4 having a heat exchange surface 5 divided into a plurality of regions according to the fourth embodiment. The plate 4 has two main areas 31 and 32. One of the main regions 31 includes a central rectangular region 33 and four triangular edge regions 34 at each corner.

All plates according to FIGS. 8 to 10 are formed in such a way that each region 31, 32, 33, 34 has a corresponding outer and / or inner contour as in the plate of FIG. 4. This contour then coincides with the corresponding virtual fixed contour at the first rotational position mentioned above with respect to the axis of rotation x and the second rotational position rotated 90 ° mentioned above. The total area or main area 31 of the area 31 is substantially the same as the total area or main area 32 of the remaining area 32.

Although the support region 41 is not shown in Figs. 8 to 10, it can be seen that this embodiment includes the support region 41 of the kind described above.

The invention is not limited to the disclosed embodiments and may be changed and modified within the scope of the following claims.

It will be appreciated that the present invention may be applied to plates that do not have the support area 41 disclosed.

Claims (24)

A central axis of rotation (x) that includes at least the first region (31,33,34) with corrugations and valleys, the plurality of corrugations extending in the first direction (A) and extending parallel to the vertical line of the plate Heat exchanger plate (4) for the plate heat exchanger (1), The plate 4 comprises at least a corrugated second region 32 of floor and valleys and the plurality of corrugations extend in the second direction B, The regions 31 to 34 each have a contour which coincides with the respective virtual fixed contours at the first rotational position of the plate with respect to the axis of rotation x and the second rotational position of the plate 4 which has been turned 90 °. Heat exchanger board. 2. The heat exchange board according to claim 1, wherein the area of the first region (31, 33, 34) is substantially the same as the area of the second region (32). The heat exchanger board according to claim 1 or 2, wherein the first direction (A) is substantially perpendicular to the second direction (B). The heat exchanger substrate as claimed in claim 1, wherein the plate (4) comprises a diagonal and the first direction (A) is substantially parallel to the diagonal. The heat exchanger substrate according to any one of claims 1 to 4, wherein the plate (4) has a contour coincident with the virtual fixed contour of the first rotational position and the second rotational position. 6. Heat exchanger substrate according to claim 5, characterized in that the plate (4) has a polygonal shape with at least four side edges (7 ', 7 "). 7. Heat exchanger substrate according to claim 4 or 6, characterized in that the plate (4) has at least four corners, the diagonals extending between two opposite ones of the corners. 8. Heat exchanger substrate according to any of the preceding claims, characterized in that the plate (4) has an edge extending around the plate and an edge region (6) extending around the plate inside the edge. The method according to claim 6 or 8, The plate is substantially square and has four side edges (7 ', 7 "), Two first side edges 7 'are parallel to each other and fold in a first direction along each fold line, the fold line extending parallel to the side edges 7' in the edge region 6 And The two second side edges 7 "are parallel to each other and fold in a second direction along each fold line, the fold line extending parallel to the side edges 7" in the edge region 6. There is, The first direction is a heat exchanger substrate, characterized in that the opposite direction to the second direction. 11. The plate (4) according to claim 8 or 10, wherein the plate (4) is corrugated with the support area (41) and the floor (42) extending around the first and second areas (31 to 34) inside the edge area (6). A heat exchanger substrate comprising pleats of (43). 11. Heat exchanger substrate according to claim 10, characterized in that the plate (4) comprises a marked boundary (44) between the support region (41) and the first and second regions (31 to 34). 12. Heat exchanger substrate according to claim 10 or 11, characterized in that at each corner the support area (41) has a ridge (42) or valley (43) extending in a direction substantially coincident with the diagonal between the edges. 12. The floor according to claim 10 or 11, wherein each floor 42 and valleys 43 of the support region 41 along the central portion of the side edges are located closest to the floor 42 and valleys 43. A heat exchanger substrate, characterized in that extending in a direction substantially perpendicular to the side edge. The heat exchanger board according to claim 12 or 13, wherein the direction of the ridges (42) and the valleys (43) of the support region (41) is continuously changed from the diagonal of the corners to the vertical direction of the central portion. The plate (4) according to claim 10, wherein the plate (4) comprises an extension plane (p) extending in parallel to the edge area (6) in the edge area (6). And wherein the valleys of (31 to 34) are in the extension plane (p), and the ridges of the first and second regions (31 to 34) are located on the extension plane (p). The method of claim 15, wherein the valleys 43 of the support region 41 are located below the extension plane p, and the ridges 42 of the support region 41 are located above the extension plane p. Heat exchanger board. A plate package for a plate heat exchanger, characterized in that it comprises a plurality of plates (4) according to any one of claims 1 to 16 arranged on top of each other. 18. The method according to claim 17, wherein every second plate (4) in the plate package (3) is rotated 90 [deg.] About the axis of rotation (x) and interspaces (13 ', 13 ") are formed between adjacent plates (4). The plates are arranged so that the regions 31 to 34 are in line with the contours of the first regions 31, 33 and 34 with respect to all the plates 4 in the plate package 3 and the outlines of the second regions 32 are A plate package, characterized in that it has a shape that matches all the plates in the plate package (3). The plate package according to claim 17 or 18, characterized in that the plates (4) in the plate package (3) are welded to each other. 20. A weld according to claim 19, wherein the first side edge 7 'of the plate 4 is in contact with the second side edge of the adjacent plate 4, and the side edges 7', 7 "are welded together. A plate package comprising the plate according to claim 9, characterized in that the plates are arranged together so that they are connected to each other by). 21. The package of claim 17, wherein all the plates are substantially the same. 22. The method according to any one of claims 17 to 21, wherein the interspaces 13 ', 13 "comprise a plurality of first interspaces 13' and a plurality of second interspaces 13", The first interspace 13 ′ allows the first medium to be conveyed through the plate package 3, and the second interspace 13 ″ is arranged so that the second medium is conveyed through the plate package 3. Board package characterized by. 17. A plate heat exchanger comprising a plate (4) according to any of the preceding claims. Plate heat exchanger comprising a plate package (3) according to any one of claims 17 to 22.